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1.继电器控制盒导线接错
1台SF30型液力叉车的启动开关无论置于OFF、ON、ST挡的任一个挡位,组合仪表灯均点亮。该叉车采用组合仪表显示各种部件的运行参数。组合仪表为单线制,设有电源线、接地线和输入、输出信号线,电源电压为12V。组合仪表电源线与继电器控制盒连接,继电器控制盒与启动开关连接。启动开关置于OFF挡时,启动开关不向继电器控制盒送电,组合仪表电源线断电。启动开关置于ON挡及ST挡时,启动开关向继电器控制盒通电,组合仪表接通,组合仪表灯点亮。用数字万用电表检测组合仪表电源接线端,无论将启动开关置于OFF、ON、ST挡任何一个挡位,均有12V电压。检查接地线接地良好。 相似文献
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汽车用组合开关性能试验台的控制系统 总被引:2,自引:1,他引:1
介绍一种汽车组合开关综合性能试验台的控制系统。该试验台控制系统采用PC机为其控制主机,步进电机驱动,具有在线测量组合开关实际力特性的功能。通过C++Builder语言编程,应用API函数实现计算机与试验台整机系统的接口,从而实现了计算机对整个系统的控制。 相似文献
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神华黄骅港翻车机系统压车器、靠车板的打开信号检测全部采用进口电感式接近开关,由于工况恶劣,经常发生损坏,严重影响安全生产。通过优化改造,用国产磁性接近开关替代进口电感式接近开关,翻车机系统性能稳定,故障率降低。 相似文献
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本文讨论了一种采用软开关结实型谐振支路构成的直流两象限和四象限调速系统,分析了直流电动机电动和制动工作状态开关的实现以及调速系统的特性.软开关直流调速系统性能优良,具有广阔的应用前景. 相似文献
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主动电磁轴承电流型开关功率放大器的调制技术 总被引:3,自引:0,他引:3
功率放大器作为主动电磁轴承中的重要环节,其性能的好坏对主动电磁轴承系统有着较大的影响.目前主动电磁轴承系统大多采用电流型开关功率放大器,电流型开关功率放大器的性能除了与电流控制器的参数有关外,与调制技术也有非常大的关系.对目前使用最多的三角波比较法、滞环比较法及采样保持法等3种调制技术进行比较研究.在介绍每种调制技术运行原理的基础上,对其静态性能、动态性能和谐波含量等特性进行重点的分析.利用Simulink建立仿真模型并制作试验样板,仿真与试验的结果表明:与滞环比较法、采样保持法相比,三角波比较法的开关频率恒定、谐波含量少、可靠性高,其综合性能比较好,对主动电磁轴承用功率放大器的设计制作有一定的指导意义. 相似文献
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为及时准确地检测矿用高压柜隔离开关触头温度,有效防范因高压开关触头过热而引发矿井供电系统短路故障,甚至出现电气火灾的危险,开发了一种矿用高压柜隔离开关触头温度检测系统,具体介绍了设计过程中应选用的设计方案,需解决的重点问题,分析了系统结构及具体检测过程,并通过试验验证了该高压柜隔离开关触头温度检测系统传感器的可靠度、信号传输的可靠度以及数据存储的可靠性,经实际验证,该温度检测系统运行安全、稳定,能很好地满足矿用高压柜隔离开关触头温度日常检测需求,具有一定的推广应用价值。 相似文献
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针对当前保温杯保温性能检测中人工检测准确度低、效率不高等问题,提出了一种基于STM32的保温杯保温性能检测系统的设计方案,并进行理论分析与实验验证.该方案以STM32F103ZET6为处理核心,采用红外温度传感器MLX90614、电磁感应接近开关、USB转串口芯片CH340等器件,实现了检测系统的软硬件设计,最后基于Q... 相似文献
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针对常规机械运动旋转量检测中存在的问题,提出了一种用接近开关通过S7-200 PLC编程,实现对机械的转速与旋转方向进行检测的方法;由于采用PLC程序实现检测,编程简单,方法可靠,对检测设备要求不高,利用机械自身的齿轮配合接近开关即可实现;通过对C650-2型车床的PLC改造,证明了该方法的有效性. 相似文献
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某雷达系统中射频开关在快速切换通道时偶尔会出现信号功率损耗过大的情况,导致信号衰减甚至中断。该文提出了一种基于同步触发的自动化测试方法,以实现射频开关使用前的插入损耗指标测试。通过编译的测控软件,实现了整个测试过程的自动化控制和数据采集,并将测试数据以及测试过程信息输出到报表中。实验证明,该方法可以准确地测试射频开关的插入损耗指标,进而实现对射频开关的质量检测,保证了雷达系统中的信号稳定性。 相似文献
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Kovalchuk BM Kim AA Kharlov AV Kumpyak EV Tsoy NV Vizir VV Zorin VB 《The Review of scientific instruments》2008,79(5):053504
High voltage, high current, and high Coulomb transfer closing switches are required for many high power pulsed systems. There are a few alternatives for closing switches, for example, ignitrons, vacuum switches, solid-state switches, high pressure gas switches (spark gaps), and some others. The most popular closing switches up to date are spark gaps due to relatively simple design, robustness, easily field maintenance, and repair. Main drawback of spark gaps is limited lifetime, which is related directly or indirectly to erosion of the electrodes. Multichannel switches and switches with moving arc have been proposed to prevent the electrodes erosion. This study investigates switches, where a spark channel is initiated in a three-electrode layout and then the spark accelerates due to electrodynamic force and moves along the extended electrodes. At a given current amplitude, the diameter of the extended electrodes allows to control the spark velocity and hence, the erosion of the electrodes providing the required lifetime. The first switch is designed for 24 kV charging voltage and approximately 4 C total charge transfer. This spark gap was tested at 25 kA peak current in 40 000 shots in a single polarity discharge and in 20 000 shots in bipolar discharge. Second spark gap is designed for 24 kV charging voltage and approximately 70 C total charge transfer. It was tested in 22 000 shots, at a current of 250 kA with a pulse length of 360 mus. In this paper, we present design of these spark gaps and trigger generator, describe the test bed, and present the results of the tests. 相似文献
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A. K. Dulatov B. D. Lemeshko Yu. V. Mikhailov I. A. Prokuratov A. N. Selifanov 《Instruments and Experimental Techniques》2014,57(6):692-696
The time parameters of PBY-47 controlled vacuum spark-gap switches (CVSSs), which are high-current pulse switches that can pass pulse currents with amplitudes of up to several hundred amperes, were investigated. When using CVSSs, it is necessary to know their time parameters, such as the operation delay time and its spread (jitter). To study these parameters, a run of experiments was performed on a laboratory test bench with sinusoidal discharge-current pulses with an amplitude of 120 kA and a period of 17 μs. When multimodule power-supply systems are developed, special attention is drawn to the agreed parallel operation of the switches of discharge modules. To determine the main requirements that are imposed on the operation stability of multimodule power-supply systems, a criterion was developed that relates the inductance of the load to the inductance of discharge modules and the number of modules to such a property of the used switches as a wide range of the operating voltages. 相似文献
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V. A. Afanas’ev E. V. Grabovskii L. V. Zagryadskii N. M. Efremov M. K. Krylov A. P. Lototskii A. A. Nikolashin A. G. Seryakov G. N. Khomutinnikov 《Instruments and Experimental Techniques》2008,51(4):540-546
PB50/50 and PB50/1000 explosive opening switches developed at the Efremov Research Institute of Electrophysical Equipment have been chosen as current switches in the MOL (magnetic sharpening liner) experimental stand. The results of studies and updating of these opening switches performed at the Russian State Research Center, Troitsk Institute of Innovation and Fusion Research during starts of the stand’s first amplifying stage and on a separate test bench with a charging current of up to 50 kA are presented. 相似文献
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分析了中央空调水系统中靶式流量开关、压差式流量开关安装和使用特性,研究了压差式流量开关在中央空调水系统的应用,得出了压差式流量开关是中央空调机组水流控制最优选择的结论。 相似文献
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为了能获取真正的开路电压与短路电流,自动适应多种规格的太阳电池片的参数要求,对太阳电池的测试的电子模型与自适应多测试系统进行研究。首先在分析原有太阳电池测试系统的基础上,进行改进,使得跟随电压真正跟随到OV;然后采用多路电子开关等手段,使得测试线路实现了自适应多量程的测试。试验结果表明,系统能真正获取开路电压与短路电流,并且,能实现电压在0~50V,电流在0.7~5.6A之间的自适应测量,开路电压不一致性〈2.2%,短路电流不一致性〈3.2%,满足了单体太阳电池与小组件太阳电池的测量。 相似文献